Spraying device



Aug. 28, 1923. 1,466.247

G. B. PICKOP SPRAYING DEVICE.

Filed May 24 J 1 GEORGE B. PICKOP, OF NEW HAVEN, CONNECTICUT, ASSIGNOE TO THE MALL IRON FITTINGS COMPANY, OF BRANFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

SPRAYING DEVICE.

Application filed ma 24, 1919. Serial No. 299,537.

To all whom it may concern:

Be it known that I, Gnonon B. PIoKoP, a citizen of the United States. residing in the city and county of New Haven, State of Connecticut, have invented certain new and useful Improvements in Spraying Devices, of which the following is a full, clear, and exact description.

This invention relates to an improved device for spraying liquids of various kinds and for spraying solids that are divided into small particles.

One of the primary objects of the invention is to provide a device of this kind in which a portion of the compressed air or other gas, which is used for entraining the liquid or solid particles, is utilized for thoroughly mixing with air the material to be sprayed or ejected in the form of a blast, so that the best results will be obtained in picking up the material and, spraying the same, For example, when a liquid is to be sprayed, such as silica wash, for instance, the latter is thoroughly agitated and mixed by my improved device, so as to prevent settling, with the result that the liquid being sprayed is of substantially uniform consistency throughout the operation. On the other hand, when the device is employed for spraying or ejecting light solid materials,

such as flaked graphite dust, fine sand and the like, the provision or mixing the material with air and thoroughly aerating the same facilitates the picking up of the sub stance from the receptacle or container. Instead of being picked up or carried along in the form of lumps, as has heretofore been often the case, a mixture of air and dust is formed which can be sprayed or ejected in a continuous and uniform manner.

The invention also purposes certain im-.

- provements in the detail construction of an air blast device of the general class mentioned whereby the manufacture of the same is simplified andcheapened, and the operation of spraying or blasting is made more convenient and efiicient.

To these and other ends the invention consists in the novel features and combinations of parts to be hereinafter described and claimed,

In the accompanying drawing:

Fig. 1 is a side elevation of apparatus embodying m improvementsshowing the same arranged or. spraying a liquid.-

rear end Fig. 2 is a front end view of the sprayin head.

Fig. 3 is a longitudinal section of the spraying head.

Flg. 4 is a side view of the adjustable air tube; and Fig. 5 is an end view of the air tube.

In the form shown, the spraying head 6 comprises an elongated and generally tubular casting 7, provided at its forward endbe operated by a pivoted hand lever 12. A

compressed air tube or pipe 13 leading from the compressed air source (not shown) is suitably connected at 14 to the rear end of the valve casing, and when the valve is opened, the air passes through the valve casing and out of the nozzle 10 thereon into the rear end of the spraying head 6.

Intermediate of the ends of the spraying head is an interior vacuum chamber 15,.

which is in direct communication with the portion of the spraying nozzle 8. The spraylng nozzle is of less diameter thanthe main part of the spraying head, and

where the passage in the nozzle joins the main part of the head, the same is ad ually increased in diameter to form a rad portion 16 by means of which the larger vacuum chamber 15' joins the nozzle passage. Extending downwardl and rearwardly from the lower part 0 the vacuum chamber 15 is a nipple 17 having an interior passage 18 of comparatively small diameter, which debouches into the lower portion 19 of the vacuum chamber. The vacuum chamber is nerally cylindrical in shape, but the wa thereof is provided at one point in its periphery with a lateral extension 20, in which the vacuum chamber extension 19 is formed. Behind and erally parallel to the nipple 17 is a similar nipple 21 having an interior passage 22,

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which communicates at its upper end by way of a small passage or duct 23 with the interior of the threaded socket 9.

Located within the socket 9 is a plug 24 carrying an air tube 25, which projects forwardly into the vacuum chamber 15. The plug 2a is provided at the rear end with an exteriorly threaded portion 26 engaging the threads of the socket so that the plug may be screwed inwardly and outwardly relatively to the socket. At its forward end, the

lug 24 has a cylindrical neck portion 27 of ess diameter than the threaded portion 26, which neck portion is adapted to fit a smooth cylindrical neck portion 28 in the sprayer body. The neck portion 28 is of less diameter than the rear end portion of the vacuum chamber and communicates directly with the latter at the forward edge of said neck portion. The rear edge of 'the neck portion 28 communicates directly with the larger threaded socket 9. The air tube 25 is of less maximum diameter than the interior diameter of the spray nozzle 8, and is in line with the interior passage of said nozzle. The tube 25 is adapted to carry the compressed air from the socket 9 through the vacuum chamber and discharge it into the spray passage, the discharge end of the tube being located approximately 'opposite the flared portion 16 by which the vacuum chamber is contracted to form the spray passage. The tube 25 is secured at its rear end portion to the plug 24 in any suitable manner, for example, by driving the tube tightly into the longitudinal bore 29 of the plug. In the form shown, the air tube is driven into the front end of the plug to a considerable distance, but it does not extend completely through the plug. For the purpose of permitting the plug to be readily screwed in and out of its socket, the rear edge of said plug is provided with diametrical notches 30, which are adapted to be engaged by the bit of a screw-driver or similar tool. When a screw-driver is engaged with the plug in the manner stated, said plug ma be readily screwed from the open end of t e socket 9 into the seat provided for the lug at the inner end of the socket, or the p ug may be adjusted so that it will be some little distance awa from said seat, as required by conditions, ut in all adjustments in which the air agitating device is used, as hereinafter described, the plug will be located in front of the mouth 31 of the small duct 23, so that a certain amount of the compressed air can pass through the ni ple 21.

0th of the ni ples 17, 21 are inclined rearwardly to a sight extent, and they are provided with exterior ribs over which ruber tubes 32, 33 may be fitted. The tube 32 18 for conducting to the vacuum chamber the material to be sprayed; and the tube 33 aeoaaev is for the purpose of conducting to the container of such material a current of air for the purpose of aerating such material prior to spraying. The flexible tubes 32 and 33 permit of independent movement of the spraying head and the material container so that the nozzle may be moved about to direct the discharge against the proper surface without disturbing the position of the container. It is apparent that a unitary, self-contained agitating spraying nozzle is provided which is easily directed to deliver at any desired point andwhich, at the same time, is provided with means to divert the motive fluid for the purpose of agitation. The container is shown at 34 in Fig. 1, and in the example illustrated, it contains a body of liquid 35. The liquid is covered 'at the top by a cover 36 on the container, but said cover is provided with one or more air holes 37, so that the upper surface of the liquid is subjected to atmospheric pressure. The tube 32 is suitably connected to a tube 38 passing downward through a hole in the cover 36, and the tube 33 is connected to a long metal tube 39 passing downward through the cover. Both of the metal tubes 38, 39 are suitably fastened to the cover in such a manner that the lower end of the short tube will be somewhat above the level of the liquid, whereas the lower end of the long tube will extend almost to the bottom.

of the receptacle.

When compressed air is admitted to the sprayer head by opening the controlling valve, such air passes through the air tube 25 and is discharged with considerable velocity adjacent the entrance of the nozzle 8.

ceptacle 34. At the same time a certain amount of the compressed air injected into the socket 9 is deflected laterally into the duct 23 and passage 22, owing to the fact short metal I that a very considerable pressure is built up in the space between the rear end of the plug 24 and the forward extremity of the discharge nozzle 10 of the air valve. The nozzle 10 is provided with screw threads (not shown), which engage the threads of the socket 9 in an obvious manner, but it will be understood that the nozzle 10 only extends into the socket 9 a comparatively small distance so'as not to cover the entranceof the duct 23. The rear edge or face of the plug 24 presents an obstruction to some of the air and causes it to be deflected out of the nipple 21 and into the tubes 33 and 39. This air is discharged into the liquid near the bottom of the same and produces athorough mixing and agitating of the liquid as long as the sprayer is in use. When spraying with silica wash, for example, the air injected into the solution near the bottom stirs up the liquid and prevents settling of the same. Further by mixing air with the liquid a vapor-is formed in the upper part of the receptacle, which is readily sucked up into the suction tube 38. Liquid and vapor are sucked up into the tubes 38, 32 by virtue of the vacuum produced therein. and pass into the vacuum chamber so as to be ejected therefrom and from the nozzle 8 along with the compressed air passing out of the tube 25.

My improved apparatus is also very useful for spraying or forming a blast of a light solid material, such as flaked graphite, blacking dust, fine sand or the like. \Vhen so used, the arrangement is not substantially different from that shown in Fig. 1. By using the agitator tubes 33, 39, the material in the receptacle is thoroughly aerated, and

it can, therefore, be very easily picked up by the air blast, which instead of drawing up the material intermittently in the form of gobs or lumps, entrains a dust-like mix true which can be sprayed out of the spraye head in a very efficient manner, 4

Where the device is adapted for use with either liquids or solids, some adjustability of the air tube 25 is desirable, and this is provided for by my invention. In spraying liquids, the air tube should be adjusted in about the manner shown in Fig. 3. That is, the plug 24 will be screwed all the way forward so as to seat its neck portion 27 against the neck portion 28 of the casing. Where solids are to be sprayed, a less degree of vacuum or suction is required, and therefore, the discharge end of the air tube 25 is drawn rearwardly to a slight extent by turning the plug 24 in the proper direction. It will be observed that the sprayer head is of very simple construction, and that'it may be manufactured at a low cost. It can be made quite small and is readily portable.

. The device can also be used for other purposes than those herein described, and the sprayer head can be employed conveniently and efficiently in many different relations and combinations.

Various changes in the details of the apparatus may be made without departing from the scope of my invention, as set forth in the claims.

What I claim is:

1. In a' spraying apparatus, a spraying head of the ejector type having amaterial lifting connection, a motive fluid connection, a chamber from which the material lifting connection issues, a motive fluid conducting tube passing through said chamber, a connection intermediate said first connections for diverting outwardly of the spraying.

head a portion of the motive fluid before its ing a threaded nozzle, of a spraying device ofthe ejector type having a socket with interior screw threads, a portion of said screw threads engaging the threads of sa1d nozzle,

and an adjustable threaded ejector-tubecarrying plug engaging another portion of the threads of said socket, said device being provided with agitating and material lifting connections. j y I 3. An ejector having a vacuum chamber intermediate of its ends, and a threaded sock- 7 et at one end communicating with said vacuum chamber, a hollow plug engaging the threads of said socket, and a tube secured within said hollow plug and extending into the vacuum chamber and nipples having bores communicating with socket and chamber, respectively.

4. An ejector having a vacuum chamber intermediate of its ends, and a threaded socket at one end communicating with said vacuum chamber, a hollow plug engaging the threads of said socket, and a tube secured within said hollow plug and extending into the vacuum chamber, said plug provided at its rear edge with screw-driver notches and nipples having bores communicating with the socketand chamber, respectively.

5. An ejector comprising a head, having an intermediate vacuum chamber, and a threaded socket at one end of the head,'a hollow threaded plug engaging the threads of said socket, and an ejector tube having one end portion driven into said plug so as to be locked therein frictionally. the other end of said tube being located in said vacuum chamber and nipples having bores communicating with the socket and chamber,

respectively.

into the chamber and nipples communicating with said chamber and inlet bore, 'respect vely.

In witness whereof, I'have hereunto set my hand on the 21st day of May, 1919.

GEORGE B. vri'oitor ,tube mounted in said plug and extending 

